13-Letter Words Containing: I,O,S,X

• a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression

• the mathematical process of finding the maximum value of a function

• the act of raising to the highest possible point or condition or position

• a group of viruses including those causing mumps and measles

• the act of positioning close together (or side by side)

• a side-by-side position

• a sexual attraction to (or sexual relations with) persons of the same sex